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Alton-IL-62500-HTMC

Both the 15-minute and 30-minute USGS quadrangle series have been abandoned. These historical maps are merely images and are not georeferenced for direct use in a GIS. Original topographic maps in our archives were scanned as full size images (generally 18 x 22 inches). Historical maps have been used to estimate geospatial changes particularly in urban areas. Changes in bay wetlands, rivers, and coastlines have also been inferred from historical maps.